Publications 2021

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https://hdl.handle.net/20.500.14170/3707

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Browsing Publications 2021 by Author "A.dawoodi"
  • Publication
    Design of a Hybrid WDMA-Optical-CDMA over Multi-Mode Fiber Transmission System based on LG Modes for Short Haul-Local Area Network
    ( 2021-03-09)
    Ghazi A.
    ;
    Syed Alwee Aljunid Syed Junid
    ;
    Syed Zulkarnain Syed Idrus
    ;
    Fareed A.
    ;
    A.dawoodi
    ;
    Mohsin A.H.
    Various optical communication technologies use Optical-Code Division Multiple Access (Optical-CDMA) as a channel access technique, which allows transmission of different users simultaneously over the optical communication channel. Therefore, Optical-CDMA permits free undue interference transmission of several users. Whereas Wavelength-division multiple access (WDMA) is a technique that can be implemented on how the optical channel can be divided into subchannels. This paper proposes a Hybrid WDMA-Optical-CDMA over multi-mode fiber (MMF) transmission system for short haul-local area network. The WDMA system is carried out by using four Laguerre-Gaussian (LG) modes that operate over four main wavelengths (1551 nm, 1550 nm, 1549 nm and 1548 nm). Additionally, the Optical-CDMA system is carried out by using one dimension Zero Cross-Correlation (ZCC) code to overcome multiple access interference (MAI) between the four ZCC codes. The performance of our system is evaluated based on eye diagrams, Q-Factor and bit-error rates (BER) measurements.
  • Publication
    Hybrid WDM and Optical-CDMA over Multi-Mode Fiber Transmission System based on Optical Vortex
    ( 2021-03-01)
    Ghazi A.
    ;
    Syed Alwee Aljunid Syed Junid
    ;
    Syed Zulkarnain Syed Idrus
    ;
    Rosdisham Endut
    ;
    Mohd Rashidi Che Beson
    ;
    Ali N.
    ;
    A.dawoodi
    ;
    Fakhrudeen A.M.
    ;
    Fareed A.
    ;
    Sharma T.
    The optical vortex has recently attracted scholars to implement it in optical tweezers, microscopy, optical communications, quantum information processing, optical trapping, and laser machining. Optical vortex beam applied classically that can be transferred to the transverse amplitude of a heralded single-photon, and optical vortex possesses a helical wavefront and carries orbital angular momentum. In this study, Optical vortex is applied in optical-CDMA (optical code-division multiple-access) in conjunction with WDM (wavelength division multiplexing). This mechanism aims to increase the capacity and security in optical communication significantly. The implementation of Laguerre-Gaussian (LG) modes with optical vortex based on one dimension zero cross-correlation (ZCC) code shows that mode coupling reduces effectively. Consequently, a positive increase in channel performance and response. Accordingly, the LG modes based on the 1D-ZCC code are investigated and propagated over multi-mode fiber (MMF) based on an optical vortex, which also substantially reduces channel effects. Consequently, all these attributes combined will result in a hybrid WDM-Optical-CDMA with an optical vortex system over MMF.